Jaguar XJ (X350). Manual — part 521

Operation can be confirmed by feeling for vibration of the mount.

•

Did both mounts operate when activated?

-> Yes

GO to Pinpoint Test G414540t8.

-> No

GO to Pinpoint Test G414540t2.

G414540t8 : CHECK THE INTERNAL DIAGNOSTIC CIRCUIT FOR SHORT
CIRCUIT

1. Measure the resistance between:

PI065, component side PI065, component side

Pin 04

Pin 01

PI066, component side PI066, component side

Pin 04

Pin 01

•

Are both resistances greater than 10 Kohms?

-> Yes

An intermittent fault may be present in the wiring harness. GO to Pinpoint Test G414540t2.

-> No

INSTALL a new active engine mount in place of the suspect unit. Clear any DTCs, test the system for

normal operation.

G414540t2 : CHECK FOR POWER SUPPLY TO THE ACTIVE ENGINE MOUNTS

1. Disconnect the right hand active engine mount connector, PI065. 2. Key on, engine off. 3. Measure

the voltage between:

PI065, harness side

Battery

Pin 02

Negative terminal

PI066, harness side

Battery

Pin 02

Negative terminal

•

Is the voltage at both pins greater than 10 volts?

-> Yes

GO to Pinpoint Test G414540t4.

-> No

REPAIR the power supply circuit. This circuit includes harness splice, PIS87. For additional

information, refer to the wiring diagrams. Clear any DTCs, test the system for normal operation.

G414540t4 : CHECK THE SIGNAL FROM THE ECM

1. Using the Jaguar approved diagnostic system, activate the mounts. 2. Measure the signal voltage

between:

PI065, harness side

Battery

Pin 03

Negative terminal

PI066, harness side

Battery

Pin 03

Negative terminal

•

Is the voltage between 1 and 2.5 volts with the mount active? (the circuit should register 4-
5 volts with the mount inactive).

-> Yes

GO to Pinpoint Test G414540t3.

-> No

GO to Pinpoint Test G414540t5.

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G414540t3 : CHECK FOR GROUND TO THE ACTIVE ENGINE MOUNTS

1. Disconnect the battery negative terminal. Link to genproc. 2. Measure the resistance between:

PI065, harness side

Battery

Pin 01

Negative lead

Pin 04

Negative lead

PI066, harness side

Battery

Pin 01

Negative lead

•

Are the resistances less than 10 ohms?

-> Yes

INSTALL a new active engine mount in place of the inoperative unit. Clear any DTCs, test the system

for normal operation.

-> No

REPAIR the ground circuit. This circuit includes harness splice, PIS88. For additional information, refer

to the wiring diagrams. Clear any DTCs, test the system for normal operation.

G414540t5 : CHECK THE SIGNAL CIRCUIT FOR SHORT CIRCUIT TO GROUND

1. Disconnect the ECM connector, EC066. 2. Measure the resistance between:

PI065, harness side

Battery

Pin 03

Negative lead

PI066, harness side

Battery

Pin 03

Negative lead

•

Is the resistance greater than 10 Kohms?

-> Yes

GO to Pinpoint Test G414540t6.

-> No

REPAIR the short circuit. For additional information, refer to the wiring diagrams. Clear any DTCs, test

the system for normal operation. REFER to the warranty policy and procedures manual if an ECM is

suspect.

G414540t6 : CHECK THE SIGNAL CIRCUIT FOR SHORT CIRCUIT TO POWER

1. Measure the resistance between:

PI065, harness side

Battery

Pin 03

Positive terminal

PI066, harness side

Battery

Pin 03

Positive terminal

•

Is the resistance greater than 10 Kohms?

-> Yes

GO to Pinpoint Test G414540t7.

-> No

REPAIR the short circuit. For additional information, refer to the wiring diagrams. Clear any DTCs, test

the system for normal operation. REFER to the warranty policy and procedures manual if an ECM is

suspect.

G414540t7 : CHECK THE SIGNAL CIRCUIT FOR HIGH RESISTANCE

1. Measure the resistance between:

PI065, harness side ECM, harness side

Pin 03

Pin H1

PI066, harness side ECM, harness side

Pin 03

Pin H1

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